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The datetime module supplies classes for manipulating dates and times. While date and time arithmetic is supported, the focus of the implementation is on efficient attribute extraction for output formatting and manipulation. With sufficient knowledge of applicable algorithmic and political time adjustments, such as time zone and daylight saving time information, an aware object can locate itself relative to other aware objects. An aware object represents a specific moment in time that is not open to interpretation.

Whether a naive object represents Coordinated Universal Time UTClocal time, or time in some other timezone is purely up to the program, just like it is up to the program whether a particular number represents metres, miles, or mass.

Naive objects are easy to understand and to work with, at the cost of ignoring some aspects of reality. For applications requiring aware objects, datetime and time https://amazonia.fiocruz.br/scdp/blog/culture-and-selfaeesteem/david-moore-s-a-defense-of-common.php have an optional time zone information attribute, tzinfothat Msthods be set to an instance of a subclass of the abstract tzinfo class.

These tzinfo objects capture information about the offset from UTC time, the time zone name, and whether daylight saving time is in effect. Only one concrete tzinfo class, the timezone class, is supplied by the datetime module. Supporting timezones at deeper levels of detail is up to the application. The rules for time adjustment across the world are more political than rational, change frequently, and there is no standard suitable for every application aside from UTC. The datetime module exports the following constants:.

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The smallest year number allowed in a date or datetime object. The largest year number allowed in a date or datetime object. An idealized naive date, assuming the current Gregorian calendar always was, and always will be, in effect. Attributes: yearmonthand day. Attributes: hourminutesecondmicrosecondand tzinfo. A combination of a date and a time. Attributes: yearmonthdayhourminutesecondmicrosecondand tzinfo.

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A duration expressing the difference between two datetimeor datetime instances to microsecond resolution. An abstract base class for time zone information objects. A class that implements the tzinfo abstract base class as a fixed offset from the UTC.]